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Lubricating compositions

a technology of compositions and lubricating oils, applied in the direction of lubricant compositions, machines/engines, mechanical equipment, etc., can solve the problems of increased wear and decrease in engine cleanliness due to deposits, increased emissions of sosub>x /sub>(sulphur oxides), nosub>x /sub>(nitrogen oxides), and particulate matter such as soot and oxides

Inactive Publication Date: 2011-04-19
THE LUBRIZOL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for lubricating a marine diesel 2-stroke engine by monitoring its performance characteristics and selecting a lubricating composition to modify them. The composition is prepared by in-situ controlled blending of at least three different fluids, including an additive package with overbased detergents and / or neutral detergents, and an oil of lubricating viscosity. The resulting lubricating composition has improved performance characteristics and is supplied to the engine. The technical effect of this invention is to provide an effective and customizable lubricating solution for marine diesel 2-stroke engines.

Problems solved by technology

Often engine operating temperatures and pressures are sufficient to break down the film of the oil of lubricating viscosity on the internal walls of the cylinder, and increased wear and decreased engine cleanliness due to deposits occurs.
However, marine diesel cylinder lubricants treated at the typical feed rates and higher sulphur fuels often produce higher emissions of SOx (sulphur oxides), NOx (nitrogen oxides) and particulate matter such as soot and oxides of sulphur.
The presence of excessive amounts of unreacted compounds in an additive package providing TBN, e.g., detergents, can contribute to the formation of deposits.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples 1-3

Preparative Examples 1-3

[0067]Preparative Examples 1-3 are Fluid 1, Fluid 2 and Fluid 3 respectively.

[0068]Fluid 1 comprises base oil, 30.8 wt % of a 400 TBN sulphonate, 11.2 wt % of 150 TBN phenate. Fluid 1 has a TBN of 140.

[0069]Fluid 2 comprises base oil, 15.8 wt % of 400 TBN sulphonate, 11.2 wt % of 150 TBN phenate. Fluid 2 has a TBN of 80.

[0070]Fluid 3 comprises marine diesel system oil.

examples 1-14

[0071]Examples 1-14 are marine diesel cylinder lubricants prepared by blending Fluids 1-3. The lubricants provide effective sufficient detergency and antiwear performance suitable for allowing a 2-stroke marine diesel engine to reduce lubricant feed rate and / or to vary fuel sulphur content. The lubricants prepared are shown in Tables 1-3.

[0072]

TABLE 1Variable TBN Lubricants to Neutralise Acid Generated Fuel SulphurWt % of fluids 1-3in Marine Diesel LubricantFluidEx1Ex2Ex3Ex415033.316.702016.733.350350505050Phenate Detergent (%)3.63.63.63.6Antiwear (wt %)1.251.251.251.25

[0073]

TABLE 270 TBN Lubricants Suitable for Reduced Lubricant Feed RatesWt % of fluids 1-3 in Marine Diesel LubricantFluidEx5Ex6Ex7Ex8Ex915059.16572.281.320000035040.93527.818.7Phenate substrate (%)3.63.63.63.63.6MDCL Feed Rate1.31.11.00.90.8(g / kW hr)MDCL—marine diesel cylinder lubricant.

[0074]

TABLE 340 TBN Lubricants Suitable for Reduced Lubricant Feed RatesWt % of fluids 1-3 in Marine Diesel LubricantFluidEx10Ex11Ex...

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Abstract

A method of lubricating a marine diesel 2-stroke engine comprising: (1) monitoring performance characteristics of said engine; (2) selecting a lubricating composition to modify the performance characteristics of the engine, wherein the lubricating composition is prepared by in-situ controlled blending of at least two different fluids, said fluids comprising: (i) a first fluid comprising an additive package with one or more overbased detergents, and optionally other performance additives; (ii) a second fluid comprising an additive package with one or more neutral detergents or overbased detergents, and optionally other performance additives, with the proviso that the first fluid has a ratio of Σ(wt % of overbased detergents) / Σ(wt % of all additives in the fluid) greater than the second fluid; and (iii) a third fluid comprising an oil of lubricating viscosity; and (3) supplying the lubricating composition of step (2) to the engine, with the proviso that the lubricating composition comprises at least one of the first fluid or the second fluid.

Description

FIELD OF INVENTION[0001]The present invention relates to a method of lubricating an internal combustion engine by monitoring engine performance and adding an additive package accordingly. The invention further relates to a composition suitable for the method, prepared from at least three fluids.BACKGROUND OF THE INVENTION[0002]It is known to provide a 2-stroke marine diesel internal combustion engine marine diesel cylinder with 40 TBN or 70 TBN lubricants containing various additives to reduce wear and improve cleanliness, especially to cylinder liners and piston rings. Often engine operating temperatures and pressures are sufficient to break down the film of the oil of lubricating viscosity on the internal walls of the cylinder, and increased wear and decreased engine cleanliness due to deposits occurs.[0003]Further, typical marine diesel cylinder lubricants are treated at approximately 1.2 to 1.3 g / kW hr. However, marine diesel cylinder lubricants treated at the typical feed rates...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C10M159/24
CPCC10M163/00C10M2207/028C10N2240/102C10N2230/52C10M2219/046C10N2030/52C10N2040/252C10N2040/26F01M9/02
Inventor MAYHEW, ALEXANDRACOOK, STEPHEN J.
Owner THE LUBRIZOL CORP